I’ve already touched on whole grains and will go into detail about flaxseeds, hibiscus tea, and nitrate-rich vegetables. Ground flaxseeds alone “induced one of the most potent blood-pressure-lowering effects ever achieved by a dietary intervention.”116 Eating just a few tablespoons a day appears to be two to three times more powerful than adopting an aerobic endurance exercise program117 (not that you shouldn’t do both—incorporate flaxseeds into your diet and exercise).